Printing-telegraph apparatus.



C. E. NELSON.

PRINTING TELEGRAPH APPARATUS.

APPLICATIDN FILED APR. 18. 1914.

INVENTOR Patented Nov. 21, 1916.

SI &

an. smarts ien'rnn'r oration CARL ERIC NELSON, F WILKINSBURG, PENNSYLVANIA, AS SIGNOR T0 UNION SWITCH SIGNAL COMPANY; OF SWISSVALE, PENNSYLVANIA, A GORPORATIQN OF PENNSYLVANIA.

To all whom it may concern:

" the following is a specification.

Be it known that I, CARL ERIC Nnnson, a citizen of the United States, residing at Wilkinsburg, in the county of Allegheny and State of 'P ennsylvania, have invented apparatus which is operated on the duplex principle, although it is not limited to this particular adaptation.

apparatus embodying my invention.

T will describe one form of apparatus embodying my invention, and will then point out the novel features thereof in claims.

7 The accompanying drawing is a view, partly diagrammatic, showing one form of 1 Referring to the drawing, the, apparatus here shownis'located at one station and is connected with a telegraph line L which extends to another station where it is compact 'ed with other apparatus which may be simied by a transmitting key K. The outgoing lar to that shown'in the drawing The ap paratus here ,shown is adapted to duplex operation, that is, the simultaneous trans.- mission of two messages over the line L in opposite directions. Current is supplied to the line L'from batteries B and B, and the supply of this current is controlled by I a transmitting relay RT, which in turn is controlled bya local circuit governed by a transmitting sunflower S v and contacts C operatsignals transmitted by key K are recorded on a home recording receiver comprising a I plurality of selector magnets M which receiver' may be of any suitable type, such for example as the type shown in United States Patent No. 1090367, granted to J. E. Wright on March 17 1914, for translator for print-v .ing telegraph systems. F or the sake of simplicity l have omitted from the present drawing all parts of this receiver except the selector magnets M Incoming signals received from the line L control areceiving relay R which governs a'local circuit in cluding a receiving sunflower S and telegraph receiver comprising aplurality of selector magnets M this receiver may be similar to the home recording receiver just PRINTING-TELEGRAPH APPARATUS.

Specification of Letters Patent. Patented Nov, 21, 19MB. I Application filed April 18, 1914. Serial No. 832,744. I i

mentioned, and for the same reason as just explained, I have omitted from the drawing all parts of this receiver except the selector magnets M 1 ranged that the receiving relay R is af- Since the apparatus here shown'is adapted I 'to duplex operation, the circuits are so arfected by incoming signal impulses but not by outgoing impulses. This selective operat1on may be accomplished in any suitable manner; as here shown, it is'accomplished by aninductive resistance 10, and an artificial line 11 comprising aresistance 11 and condensers 1-1 connected with ground. The term nals of winding 10 are connected respectively with the telegraph line L and the artificial line 11, and the middle point of this winding is connected with a wire 12 to which current is supplied by batteries B, B".

The terminals of the winding of the receiving relay R are connected with lines Land 11 respectively. With this construction, outgoingcurrent impulsesfrom batteries B, B divide at the'middle point of winding 10 and pass through the halves of. this winding in opposite directions; "they then pass equally through the ,two lines L and 11 so 'fore not afiected thereby, Incoming current impulses on line L, however, have two multiple paths to ground, viz., through winding 10 and through relay B and because of the impedance of winding 10, a sufficient proportion of this current passes through relay R to cause operation thereof.

The receiving sunflower S comprises as usual aframe carrying a plurality of fixed contact plates 13, six of which are electrically' connected with the. six. magnets M respectively of the incoming signalereceiver. A wiper 14 is mounted frictionally on a shaft 15 which rotates constantly in the direction indicated by the arrow. This wiper is restrained from rotation by a hook armathat as far as these outgoing impulses are ture'17 controlled by an electromagnet 16.

contact plates 13 successively and thereby connecting magnets M successively with a wire 18 so that one or more of these magnets will be energized from a battery 13 dependmounted at 21 and is biased to the raised position by a spring 28. When depressed it moves a bar 23 which is mounted to reciprocate in. guides 25. It is understood that this key K is one of a plurality of similar keys embodied in a keyboard, each of which moves a bar similar to the bar 23. The contact fingers C are pivoted at points 26 and are biased to the open position, that is, away from the corresponding contact C, by springs 40. Each finger is provided with a rod 27 which extends laterally under all of the bars 23, and each bar 23 is provided with one or more downwardly-projecting lips 23 which engage with the coresponding rod or rods 27 when the bar is moved by the key and thereby close one or more of contacts C. It is understood that, as usual, the several bars 23 are provided with different combinations of lips 23 so that diiierent coinbinationsof contacts C are closed according to the key which is depressed.

The transmitting sunflower S is similar to sunflower S except that shaft 15 rotates in the opposite direction as indicated by the arrow. Viper 14: is in this case restrained from rotationby a stop 29 pivoted at 29 and connected by a rod 30, with a lever 31 pivoted at; 31 A universal bar 32 extends laterally under all of the keys K and operates the lever 31, so that the depression of any keydepresses bar 32 and lever 31 and thereby releases wiper 14 4 The fixed contact member C with which each contact C engages is connected by a wire 33 with one of the plates 13 of sunflower S and each contact (Ms connected by a wire 34. with a selector magnet M of the home recording receiver hereinbefore mentioned. It will be seen, therefore, that each selector magnet of the home recording receiver is in series 'with a contact CC of the transmitting device so that this home recording receiverv records the signals which are transmitted over the line. By connecting the magnets M in this manner I avoid the necessity for a separate sunflower for the L which energizes the receiving relay at the other station thereby operating the magnet corresponding to magnet 16 so that the receiving sunflower at said other station is re leased. Then as the wiper 14 touches the several plates 13 successively it [causes a certain group of magnets M to be energized according to the group of contacts C which are closed, and also causes successive operations of relay R thereby sending a corresponding signal over the lineL. 1

Having thus described my invention, what I claim is I Printing telegraph apparatus comprising a keyboard comprising a plurality of keys and a plurality of circuit controlling contacts the number of contacts being less than the number of keys, a source of current, a trans mitting sunflower forconnecting said con--- tacts inturn with said source ,and tending normally to rotate; means controlled by each 1 for releasing said sunflower, and a home recording receiver comprising a plurality of selector magnets, each of said magnets being connected in series with one of said contacts.

In testimony whereof I afiix my signature in presence of two witnesses.

CARL ERIC-NELSON,

Witnesses:

' A. HERMAN WEGNER,

R. L. KISTLER. 

